resumo
The compositional dependence of the piezoelectric properties of self-polarized PbZr1-xTixO3 (PZT) thin films deposited on Pt/TiO2/SiO2/Si substrates (x = 0.47, 0.49 and 0.50) was investigated by in situ synchrotron X-ray diffraction and electrical measurements. The latter evidenced an imprint effect in the studied PZT films, which is pronounced for films with the composition of x = 0.50 and tends to disappear for x = 0.47. These findings were confirmed by in situ X-ray diffraction along the crystalline [100] and [110] directions of the films with different compositions revealing asymmetric butterfly loops of the piezoelectric strain as a function of the electric field; the asymmetry is more pronounced for the PZT film with a composition of x = 0.50, thus indicating a higher built-in electric field. The enhancement of the dielectric permittivity and the effective piezoelectric coefficient at compositions around the morphotropic phase boundary were interpreted in terms of the polarization rotation mechanism and the monoclinic phase in the studied PZT thin films. Published by AIP Publishing.
palavras-chave
MORPHOTROPIC PHASE-BOUNDARY; X-RAY-DIFFRACTION; LEAD-ZIRCONATE-TITANATE; POLYCRYSTALLINE FERROELECTRICS; SOLID-SOLUTION; POLARIZATION; PBZR1-XTIXO3; ORIGINS; FIELD
categoria
Physics
autores
Cornelius, TW; Mocuta, C; Escoubas, S; Merabet, A; Texier, M; Lima, EC; Araujo, EB; Kholkin, AL; Thomas, O
nossos autores
Andrei Kholkin
Investigador Principalagradecimentos
The authors gratefully acknowledge the SOLEIL Synchrotron for allocating beam time. Detector and Electronics Support Groups, as well as P. Joly, are acknowledged for the excellent technical support during the experimental campaign at SOLEIL Synchrotron on DiffAbs beamline. We would like to express our gratitude to the CAPES-COFECUB (Project No. 801-14), CNPq (Grant No. 304604/2015-1 and Project No. 400677/2014-8) and FAPESP (Project No. 2010/16504-0) for their financial support. A.K. acknowledges CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013) financed by the national funds through the FCT/MEC and, when applicable, cofinanced by FEDER under the PT2020 Partnership Agreement. This work was in part supported by the Government of Russian Federation (Grant No. 074-U01).